Kissmart&reg; 2-in-1 Bluetooth Transmitter & Receiver Dongle Wirelss Music Streaming for Tablet / PC / Laptop / TV / Cellphone / Speaker with 3.5mm Audio Jack Output CSR V3.0 160mAh 2-In-1 Bridges Your Bluetooth Device To Your Speakers Or Your Bluetooth Speakers To Your Audio Device Simple one-button switch to shift between transmitter(TX) and receiver(RX) mode. TX Mode:Plug In To Your Non-Bluetooth Device And Pair Up Your Bluetooth Speaker Or Headset. RX Mode: Plug Into Your Non-Bluetooth Speaker And Pair Up Your Bluetooth Phone Or MP3 Player Bluetooth-enable all 3.5mm media devices (enable Bluetooth receiving: speakers, headphones and more; enable Bluetooth transmission for: MP3, CD / DVD players, e-readers, TVs and more) Built in battery for portable use, or connect to a USB power source for always-on application. Ideal For Any Powered Speakers Or Devices Using Standard RCA Or 3.5mm Jack Or AD2P Bluetooth.